Marketplace
Agents
Agents for Haarness: specialists with their own instructions and tools, for reviewing, testing, writing and more.
Observability Engineer
Sets up metrics, logs, tracing, alerting and SLOs with tools such as Prometheus, Grafana and OpenTelemetry.
Bash Scripting Expert
Writes defensive, portable shell scripts with strict mode, ShellCheck, Bats tests and safe cleanup traps.
Backend Architect
Designs backend services and APIs: boundaries, REST/gRPC/GraphQL contracts, resilience and observability.
API Documenter
Writes OpenAPI 3.1 specs, API reference pages, examples and migration guides for developer portals.
GraphQL Architect
Designs GraphQL schemas and federation, resolves N+1 issues and hardens query cost and auth.
AI Application Engineer
Builds LLM features such as RAG search, agents and tool use, with cost, safety and evaluation in mind.
Accessibility Expert
Audits and fixes UI for WCAG 2.2, keyboard and screen-reader support, contrast and focus handling.
Vue and Nuxt Expert
Writes Vue 3 Composition API code and Nuxt 3 apps with Pinia stores, reactivity tuning, Vitest tests and SSR setup.
WordPress Architect
Builds and tunes WordPress sites: custom themes, plugins and blocks, WooCommerce, headless setups, caching and hardening.
WebSocket Engineer
Designs real-time messaging with WebSockets or Socket.IO: reconnection, presence, pub/sub scaling across nodes and load testing.
UX Researcher
Plans interviews, usability tests and surveys, then turns findings into personas, journey maps and design recommendations.
Site Reliability Engineer
Defines SLIs, SLOs and error budgets, cuts toil, tunes alerts and on-call, and plans capacity so services stay reliable.
Spring Boot Engineer
Builds Spring Boot 3 services: REST and WebFlux APIs, Spring Data and Security, cloud patterns, Testcontainers and native images.
Scrum Master
Coaches agile teams through sprint planning, retrospectives, backlog refinement, impediment tracking and delivery metrics.
README Generator
Writes a README from what the repository really contains, reading code, scripts and configs instead of guessing commands.
Rails Expert
Works on Rails 7 and 8 apps, reading Gemfile.lock first so advice fits the version, e.g. Solid Queue vs Sidekiq or Kamal deploys.
Research Analyst
Researches a question across many sources, weighs how credible each one is and writes a synthesized report with recommendations.
Project Manager
Builds project plans with work breakdowns, schedules, risk registers, budgets and status reports for complex initiatives.
Product Manager
Helps shape product strategy: synthesizes user research, scores features with RICE, drafts roadmaps, metrics and launch plans.
Platform Engineer
Designs internal developer platforms: golden-path templates, self-service environments, Backstage catalogs and GitOps flows.
PowerShell 7 Automation
Writes cross-platform PowerShell 7 scripts for Azure, Microsoft Graph and CI pipelines, with -WhatIf support and safe secret use.
Next.js App Developer
Builds and tunes Next.js App Router apps: server components, server actions, caching, metadata for SEO and Core Web Vitals.
Penetration Tester
Plans and runs authorized security tests on web apps, APIs and infrastructure, then reports confirmed findings and fixes.
MCP Server Developer
Builds and debugs Model Context Protocol servers and clients with the TypeScript or Python SDKs, covering schemas, auth and tests.
Laravel Specialist
Develops Laravel apps with Eloquent models, queues and Horizon, Sanctum auth, events, Pest tests and Octane tuning.
Kotlin Specialist
Writes idiomatic Kotlin for Android, Ktor servers and Multiplatform, with a focus on coroutines, Flow, null safety and Compose.
GDPR and CCPA Advisor
Checks how a product collects and handles personal data against GDPR and CCPA/CPRA, and returns a ranked gap list with fixes.
Git Workflow Manager
Sets up branching models, PR rules, commit conventions, hooks and release automation so a team keeps a clean Git history.
Expo React Native Expert
Pair with a specialist on Expo and React Native apps, from navigation and animation to builds and updates.
UI Design Review
Opens a page in a real browser across viewports and reports ranked visual, responsive and WCAG issues.
Email Deliverability Engineer
Improves inbox placement: SPF, DKIM and DMARC setup, bounce and complaint handling, list hygiene, IP warm-up and compliance.
Electron Desktop Developer
Builds secure Electron desktop apps with context isolation, validated IPC, native menus, auto-updates, code signing and packaging.
Competitive Analyst
Maps direct and indirect competitors, benchmarks features and pricing, runs a SWOT and suggests positioning moves.
Docker Expert
Improves Dockerfiles and Compose setups: multi-stage builds, smaller hardened images, BuildKit caching, SBOMs and image signing.
CLI Tool Developer
Designs command-line tools: command layout, flags, prompts, progress output, shell completions and cross-platform packaging.
Chaos Engineer
Designs controlled failure experiments and game days with a stated hypothesis, a limited blast radius and fast rollback.
Devil's Advocate
Stress-tests a plan or proposal and returns exactly three risks, each rated by severity with the evidence to check and a mitigation.
A/B Test Analyst
Reads experiment results the right way: lift, confidence intervals, power, guardrails and sample ratio checks, then a ship call.
Angular Architect
Plans and builds large Angular apps: RxJS and NgRx patterns, signals, lazy loading, module federation and Nx workspaces.
Unreal Engine Developer
Writes Unreal Engine 5 C++ and Blueprint systems: gameplay framework, replication, rendering features, editor tools and profiling.
Supply Chain Security
Audits dependencies for known CVEs, malicious or typosquatted packages, licence conflicts and loose lockfiles, and helps build SBOMs.
Game Designer
Designs game mechanics, progression, economies and difficulty curves, with balancing formulas and design documents.
NoSQL Database Specialist
Models data and tunes performance for MongoDB, Redis, Cassandra and DynamoDB: indexes, aggregations, key design and monitoring.
Fact Checker
Checks claims against independent sources, rates how credible each source is and returns a verdict with confidence and citations.
Computer Vision Engineer
Builds detection, segmentation, OCR, tracking and face-recognition pipelines and optimizes the models for ONNX or TensorRT.
Playwright Test Debugger
Finds why a Playwright test fails or flakes by rerunning it, reading traces and classifying the cause, then proposes a precise fix.
Spec Miner
Extracts requirement and invariant specs from an existing codebase into OpenSpec-style files with links to the enforcing code and tests.
RAG Pipeline Reviewer
Reviews retrieval-augmented generation code for chunking, reranking, low-context fallbacks and missing RAGAS-style evaluation.